A 354-foot-tall waterfall flowing down the side of a futuristic skyscraper sounds like the kind of thing you would expect to see in a big-budget sci-fi movie, but it’s actually a sight you can feast your eyes on in real life, if you’re ever in the Chinese city of Guiyang.

A video of the stunning waterfall, with stream of water rippling in the sun and creating a perpetual rainbow in front of the Liebian International Plaza skyscraper, went viral on social media this week, leaving millions of people around the world scratching their eyes. Measuring 108 meters (354 feet), this technological wonder is believed to be the highest artificial waterfall in the world.